Abstract: A mechanical caliper type disc brake is disclosed for vehicles such as trucks and trailers where high torque ratings are required. The brake structure of the invention is employed for applying frictional braking forces to opposite braking surfaces of a rotatable rotor.

Abstract: The modulator of an antiskid device for air brakes of the type wherein a throttling electric signal is produced to change the braking pressure applied by brake actuators from a rapid increase state to a slow increase state before the braking pressure reaches a pressure increase target value, a pressure reducing electric signal is produced by rapidly decrease the braking pressure when the braking pressure has reached the pressure increase target value, and a throttling electric signal is produced again to change the braking pressure from the rapid decrease state to a slow decrease state before the braking pressure reaches a pressure decrease target value comprises a first solenoid assembly, a second solenoid assembly, a first pilot valve assembly, a second pilot valve assembly and a main valve assembly.